olmsted



, 2 Sheets-Sheet- 1. J. OLMSTED.

(No Mpdel.)

ELECTRIC LAMP.

"Patented Jan. 17,1882.

1 L: LQM HLE (No Model.) I 2 Sheets-Sheet 2.

- J. OLMSTBD.

ELEGTRIG- LAMP.

N0. 252,397. Patented Jan. 17,1882.

fittest: f7 $249 z W W. 4

UNITED STATES PATENT OFFICE.

JOSEPH OLMSTED, OF NEW YORK, N. Y., ASSIGNOR TO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OF SAME PLACE.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 252,397, dated January 17, 1882.

Application filed September 7, 188i. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH OLMS'IED, of New York, in the county and State of New York, have inrented certain new and useful Improvements in Electric Lamps, of-whi-ch the following is a specification, reference being bad to the drawings accompanying and forming a part thereof.

Myinvention, broadly considered, is' an improvement in detent or rack-and-pinion lamps, or those in which therelative position of the carbon pencils is adjusted and'controlled through the instrumentality of a magnet or magnets, a movable armatureg'and a train of wheels, the 1atter.being in gear with one of the carboncarriers, and controlled in their movement by the magnets.

The lamp which forms the subject of this my presentinvention is distinguished from others of its class by its extreme simplicity and delicacy of action, the invention being directed mainly to ajeduction of the number of the parts hitherto considered necessarytothe successful operation of these lamps.

In theaccom panying drawings, Figure 1 represents in part section the interior mechanism of the lamp; Fig. 2, a plan of the same detached from the lamp, and Fig. 3 aview taken at right angles to Fig. 1 and illustrating the same parts.

Similar letters of reference indicate corresponding parts in the three figures.

The letter A designates the usual metallic frame for supporting themed-controlling mechanism,which' is secured to the uppercross-bar or yokeof the lamp-frame, a portion of which onlyis shown. In the lower part of said frame A, and rigidly secured to the side thereof, is an electro-magnet with coilsof coarse insulated wire. This magnet is indicated by the letter Fin Fig. 1, where its means of attachment to the frame are arbitrarily represented by heads or plates of diam-agnetic material. The core of soft iron used in the main magnet is extended at right angles to the main portion at either end to form pole-pieces F. Immediately in front of the aforesaid pole-pieces is a second eleotro-magnet, E, the coils of which are of fine insulated wire, and the core of which is extended at either endin po1e-piecesE,ina similar manner to thatot the main cores F. Magnet E is supported in standards by pivotingscrews f, so thatit may be free to turn upon itshorizontal axis and permit the pole-pieces E to swing in front of pole pieces F. The inoyement of the magnet E may be limited by suitable stops when necessary, and there may be employed therewith a spring for opposing. the upward movement of the pole-pieces, if'so desired. The direction of uindingof the coils of said magnet is such as to produce in the pole-pieces a polarity similar to that in the adjacent .poles of magnet F.

G is a bar or strip of metal secured to the pole-pieces E',near their ends, in substantially 6 the manner indicated in Fig.

. Above the magnets are projections or arms,

0, from the side of the frame A, to which, by means of pivoting-screws S, a frame, K, of suitable construction, is pivoted. At one end of said frame is journaled a shaft carrying a pinion, H, and a gear-wheel, G, and near the other end, or at the requisite distance from the first shaft, is journaled a second shaft, R, carrying a'fpinion which engages with gearwheel 0 and a fan, L. The frame K is prevented from tilting below a predetermined point bya stout spring, or simple stop, N, extending from the frame A. v

D is the. carbon-carrier. It is caused to pass through suitable guides in the top and bottom of the frame A, and is provided with a rack, by means of which it meshes with the pinion H.-

The operation of thelatnpis as follows: The current enters through the main conductor M and passes through the coils of magnet F, from whence it is carried to the lampframe, to and through the upper carbon, andthen to thelower carbon, andofl to line. The shunt-circuit (represented by m) conveys a portion of the curo rent'through the magnetE; butthis latter, be ing of very high resistance, will be afl'ected only to a slight extent under the normal conditions of arc. 1ts pole=pieces, therefore, be in g practically neutral in comparison with pole- 9 5 pieces F, will be drawn up in line with them. The bar G, being by this means brought up against the wheel 0, raises the same and looks it against movement. The carbons are thus separated and the are formed. Asthe carbons I00 are consumed more curreutistlirerted through the c0ils-of magnet E, upon which the polepieces begin to exhibit an increasing magnetism and neutralize the attractive efi'ectof magnet F. The weightof the carbon-carrier and its appurtenances causes the pole-piece E to fall away from the others until the frame K is stopped bydetent N. Bythis means the pr ssureof the bar G on wheel 0 is relieved and the latter allowed to turn, its motion being necessarily slow on account of the fan L. These movements are of eourseso minute as hardly to be perceptible. The above, however, serves to illustrate the principle of action.

The above-described lamp is one of great simplicity and efi'ectiveness, and,owing to the small number of parts employed, may be produced at small cost.

\Vhat I claim as new, and desire to srcure by Letters Patent, is

1. The combination, in an electric lamp, with the graYitnt-ing carbon-carrier, of a swinging frame, one or more gear-wheels carried thereby and meshing with the said carrier,-a stationary detent for intercepting the tilting of the frame atapredetermined point,andan electro-magnet and movable armature in conjunction with oneof said wheels, by the action of which the feed and adjustment of the carbons are effected, substantially in the manner licreinbefore set forth. I

2. The combination, in an electric lamp, with the gravitating carbon-carrier, of a swinging frame, one or more gear-wheels carried thereby and-meshing with the said carrier, 21- sta tionary detent for intercepting the tilting of the frame at a predetermined point,a magnet in the main circuit, and a'pirotcd or swinging armature therefor, wound with fine wire,f0rming a part of a shunt or derived circuit in conjunction with one of said wheels, and by the movementof which, caused by the varying attraction of the magnet, the feed and adjustment of the carbons are effected, substantially in the manner hereinhefore set forth.

In testimony whereofl have hereunto set my hand this 3d day of September, 1881.

JOSEPH OLMSTED.

Witnesses R. F. BARNES, PARKER W. PAGE. 

